Samuel ba



UN TED STATES PATENT OFFICE.

SAMUEL BARR, OF PROVIDENCE, RHODE ISLAND;

COMPOUND oe COATlNG GAS-TUBING, 84c.

SPECIFICATION forming part of Letters latent No. 276,998, dated May 8, 1883. i l Application filedFebruary 20,1883. (Specimensl' To all whom it may concern I Be it known that I, SAMUEL BARR, a citizen of the United States, residing at Provideuce, in the county of Providence and State I of Rhode Island, have invented a new and useful. compound or composition of matter to p be usedfor the purpose of rendering gas-tubing and all other articles of manufacture used for the conduction or holding of gas impermeable to the escape of the same, of which the following is a specification.

My invention has special relation to that class of tubing employed in the conduction of other braiding.

illuminating-gas, known in the trade as flexi-' ble tithing, which has for itsfoundation a spiral coil of wire surrounded by cotton or positionsof matter prior to my invention have been employed to render such flexible tubing thoroughly gas-tight, whichhave met with success in a greater or'less degree; but the great desideratum of producing a compound which would be unaffected by heat, so that it by chandeliers, gas-stoves, drop-lights, and

pounds, mixtures, or washes which thus far and get out of shape, and that the compounds or coatings with which they are treated often.

similar articles of manufacture, had notbeen accomplished until I invented my compound.

I havebeen for seventeen years actively engaged in the manufacture of flexible gas-tubing, and from my extended experience with such business. am. very well acquainted with the merits and demerits of the various comhavebeen used as a coating or coatings for flexible tubing, and I have observed that the tubes so treated with them are liableto, and generally very often do, losethe flexibility crack, thus losing their so-called impermeability. This is especially the case with tubes coated with a combination of glue and glycerine, and the compound which has amber for one of itsingredients has been found by me,

after long-continued trial, tobevery much lacking utility in the special functions for 5? which it was designed. To remedy suchdefects inflexible gas-tubing, and to produce it Many compounds and com-- compound which would be only aflectcd by extreme heat or cold, which would not detract from the flexibility of the tube to which it is applied, and which would render the same perfectly impervious to the escape of gas, has

long been a subject of experiment by me, and I after trying many articles I have found that by adding a slight quantity of bichromate of potash, or any of its equivalents, to a conibination of glue and glycerine,the results so long desired have been accomplished. By using bichromate of potash a hardness is given to the compound, while the tubing loses none of its flexibility. Moreover, I am able to use moreglycerine.

To enable those skilled in the art of manufacturing flexible gas-tubing to make and use my invention, I will now describe the ingredients of my compound, the proportions in which the same are mixed to make the compound, and the way in which the compound when made is applied to the tube.

.1 take in or about the following proportions:

glue, thirty pounds; glycerine, thirty pounds;--

bichromate of potash, one and one-fourth ounce; water sufficient to mix. The glue and glycerine are placed in a proper receptacle and soaked until the mass is swelled through the expansion of the glue, and then the same is reduced to a semi-viscid state by the application of heat. The bichromate of potash, having been previously dissolved, is then added to the glue and glycerine. The compound is then ready for use. The tubes, as they come from the braidingmachine, are then dipped therein as many times as'is necessary to produce thereon the requisite thickness of the compound. After dipping, the tube is sus pended in such a way that it will receive the rays of the sun, and at the same time permit the superfluous compound to drip therefrom. When the tube has been coated with the dc sired thickness of compound, and the same has hardened sufficiently, it is in a condition to receive its final envelope of fancy braid, tips, 850., and is then ready for'the market. Iam aware thatit is well known in the arts that bichromate of potash, when-combined with'gelatine, will render the sameinsoluble, asshown in the photographic art; but I am not aware that all of theingredients of my compound have ever been usedin the manner,

in the proportions, and for the purpose which I havespecified above.

I am aware that a composition consisting 5 of glue, cork, glyeeriue, and chromic acid, with other ingredients, has been used for the purpose of coating fabrics to imitate leather, 'moroceo, &c., and that a patent therefor was granted to Wm. Bell, July 28,1874,N0. 153,473; but the use of such a compound I hereby disclaim, as I do not consider it efficacious as a coating for flexible gas-tubing.

My compound can also be used on cotton cloth for the purpose of making an excellent 15 imitation of leather, and it is my intention to apply in the future for a patent for the useof the same for such purpose.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

In combination with flexible gas-tubing, as a coating to prevent the escape of gas, the compound composed of glue, g1 ycerine, and biehromate of potash, in or about the proportions specified.

SAMUEL BARR.

Witnesses SAML. T. DOUGLAS, G110. W. OUsHING; Jr. 

